Rear tire: 650B×2.3″.
Velopedia Bicycle Archive
2021 Specialized Roll Sport - Low-Entry
Original specifications: geometry for 3 published sizes.
Selling this bike? Get the spec link and selling options
At a glance
- Model year
- 2021
- Category
- City & Commuter
- Original MSRP
- $800.00
- Sizes
- S, M, L
- Colors
- Gloss Blush / Smoke / Satin Black Reflective, Gloss Oasis / Forest Green / Satin Black Reflective, Satin Maroon / Charcoal / Black Reflective, Gloss Teal Tint / Hyper Green / Satin Black Reflective
- Geometry
- 3 manufacturer sizes
- In this record
- 23 specifications · 4 archived images · original MSRP · geometry
- Archive ID
- 900004320
Original buildAluminum
Frameset
| Frame Construction | Specialized A1 Premium Aluminum, Ground Control Positioning, formed tubes, post-mount disc, fender/rack mounts |
|---|---|
| Frame Material | Aluminum |
| Fork | Steel formed tubes, post-mount disc, fender/rack mounts |
| Fork Material | Steel |
Drivetrain
| Shifters | Shimano EF500, 7-speed |
|---|---|
| Front Derailleur | Shimano Tourney FD-TY710 |
| Rear Derailleur | Shimano Altus, 7-/8-speed |
| Crankset | Shimano Tourney, 3-piece, 46/30T |
| Bottom Bracket | BSA, square-taper, 68mm |
| BB Shell Width | 68 mm |
| Cassette | Shimano HG200, 7-speed, 12-32t |
| Chain | KMC Z7, 7-speed w/ Missing Link™ |
| Pedals | Specialized City, platform |
Brakes
| Brakes | (F) Tektro SPD-21 Mechanical Disc, Post Mount, 160mm / (R) Tektro SPD-21 Mechanical Disc, Post Mount, 160mm |
|---|
Cockpit & Contact Points
| Handlebar | Specialized Roll, 6061 alloy, 15-degree backsweep, 125mm rise, 31.8mm |
|---|---|
| Stem | Specialized, 3D-forged alloy, 4-bolt, 7-degree rise |
| Saddle | Body Geometry "The Cup," 6-degree rise, steel rails, 245mm |
| Seatpost | Spring suspension, alloy, 27.2mm, 2-bolt clamp |
Wheels & Tires
| Hubs | (F) Alloy, 6-bolt disc, loose ball bearing, quick-release, 32h / (R) Alloy, 6-bolt disc, 7-speed freehub, loose ball bearing, quick-release, 32h |
|---|---|
| Rims | 650b disc, double-wall alloy, pinned, 32h |
| Spokes | Stainless, 14g |
| Front Tire | Nimbus II Sport, 650b x 2.3" |
| Rear Tire | Nimbus II Sport, 650b x 2.3" |
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements3 sizes · 20 measurements
| Measurement | S | M | L |
|---|---|---|---|
| Seat tube | 370 mm | 450 mm | 500 mm |
| Effective top tube | 594 mm | 615 mm | 643 mm |
| Head tube | 155 mm | 190 mm | 215 mm |
| Head-tube angle | 68° | 69° | 69° |
| Seat-tube angle | 67° | 67° | 67° |
| Chainstay / rear center | 480 mm | 480 mm | 480 mm |
| Wheelbase | 1088 mm | 1097 mm | 1124 mm |
| Bottom-bracket drop | 70 mm | 70 mm | 70 mm |
| Bottom-bracket height | 285 mm | 285 mm | 285 mm |
| Reach | 346 mm | 352 mm | 370 mm |
| Stack | 538 mm | 621 mm | 644 mm |
| Standover height | 495 mm | 495 mm | 495 mm |
| Fork offset / rake | 55 mm | 55 mm | 55 mm |
| Front center | 617 mm | 626 mm | 653 mm |
| Trail | 84 mm | 77 mm | 77 mm |
| Fork length / axle-to-crown | 420 mm | 420 mm | 420 mm |
| Seatpost length | 350 mm | 350 mm | 350 mm |
| Crank length | 170 mm | 170 mm | 170 mm |
| Stem length | 60 mm | 60 mm | 60 mm |
| Handlebar width | 680 mm | 680 mm | 680 mm |
Dimensions as recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM = pedal turns per minute.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
Parts & serviceability
Find replacement parts
More parts (5)Fewer parts

Redshift Sports ShockStop Suspension Seatpost Black, 27.2x350mm, 35mm Travel
Replacement option
Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.
Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: 2021 Specialized Roll Sport - Low-Entry · City/Commuter · Published sizes: S, M, L
Frame and fork
Inspect the frame and fork →Archived: Frame: Specialized A1 Premium Aluminum, Ground Control Positioning, formed tubes, post-mount disc, fender/rack mounts · Fork: Steel formed tubes, post-mount disc, fender/rack mounts · Steel
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano EF500, 7-speed · Front derailleur: Shimano Tourney FD-TY710 · Rear derailleur: Shimano Altus, 7-/8-speed · Crankset: Shimano Tourney, 3-piece, 46/30T · Bottom bracket: BSA, square-taper, 68mm · Cassette: Shimano HG200, 7-speed, 12-32t · Chain: KMC Z7, 7-speed w/ Missing Link™
Brakes
Inspect the brakes →Archived: Brakes: (F) Tektro SPD-21 Mechanical Disc, Post Mount, 160mm / (R) Tektro SPD-21 Mechanical Disc, Post Mount, 160mm
Wheels and tires
Check wheels and tires →Archived: Rims: 650b disc, double-wall alloy, pinned, 32h · Hubs: (F) Alloy, 6-bolt disc, loose ball bearing, quick-release, 32h / (R) Alloy, 6-bolt disc, 7-speed freehub, loose ball bearing, quick-release, 32h · Front tire: Nimbus II Sport, 650b x 2.3" · Rear tire: Nimbus II Sport, 650b x 2.3"
Controls and contact points
Archived: Handlebar: Specialized Roll, 6061 alloy, 15-degree backsweep, 125mm rise, 31.8mm · Stem: Specialized, 3D-forged alloy, 4-bolt, 7-degree rise · Seatpost: Spring suspension, alloy, 27.2mm, 2-bolt clamp · Saddle: Body Geometry "The Cup," 6-degree rise, steel rails, 245mm · Pedals: Specialized City, platform
Before and during the test ride
Follow the full used-bike inspection order →Have you owned this bike?Help preserve its real-world history by sharing your owner experience.
Share the details that would help another rider understand how this model fits, rides and holds up over time. Velopedia reviews every contribution before publication.
Already contributed? Send me a fresh private edit link
For privacy, Velopedia shows the same confirmation whether or not an experience exists.
Gallery4 images
Checking current listings…
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.





